Boron Nitride Ceramics
Custom Hot-Pressed Boron Nitride Ceramic Parts
Custom hot-pressed boron nitride ceramic parts offering excellent machinability, electrical insulation, thermal-shock resistance, and high-temperature performance for vacuum, electronic, and molten-metal applications.
Detailed Product Information
Typical Technical Properties
|
Parameter |
Typical Value |
|
Material |
Hot-pressed hexagonal boron nitride |
|
Abbreviation |
HPBN / hBN |
|
Color |
White or ivory |
|
Density |
1.9–2.2 g/cm³ |
|
Thermal conductivity |
Approximately 40–50 W/(m·K) |
|
Coefficient of thermal expansion |
Approximately 6.5–7.5 × 10⁻⁶/K |
|
Volume resistivity |
>10¹² Ω·m |
|
Dielectric constant |
Approximately 3.8–4.3 |
|
Dielectric strength |
Grade and test-method dependent |
|
Flexural strength |
>35 MPa |
|
Compressive strength |
>200 MPa |
|
Recommended temperature in oxidizing atmosphere |
Up to approximately 850°C |
|
Maximum temperature in vacuum or inert atmosphere |
Up to approximately 2,000°C for suitable grades and conditions |
HPBN is anisotropic. Thermal conductivity, thermal expansion, and mechanical properties may vary according to the material grade and measurement direction.
Custom Hot-Pressed Boron Nitride Ceramic Parts
Hot-pressed boron nitride (HPBN) is a machinable ceramic produced by densifying hexagonal boron nitride powder under high temperature and pressure. It combines high-temperature electrical insulation, thermal-shock resistance, low friction, chemical stability, and excellent machinability.
TecCera supplies custom HPBN tubes, rods, plates, crucibles, nozzles, insulators, rings, fixtures, and complex precision components manufactured according to customer drawings and operating requirements.
Key Features
- Excellent machinability using conventional equipment
- High electrical resistivity and dielectric strength
- Good thermal conductivity
- Low thermal expansion
- Excellent thermal-shock resistance
- High-temperature stability in vacuum and inert atmospheres
- Low dielectric constant and dielectric loss
- Good chemical inertness
- Low coefficient of friction
- Non-wetting by many molten metals and glasses
Typical Applications
- High-temperature electrical insulators
- Vacuum-melting crucibles and components
- CVD and PVD processing fixtures
- Electronic substrates, coil forms, and prototypes
- Microelectronic packaging components
- Brazing and metallizing fixtures
- Microwave and vacuum-tube components
- Break rings for horizontal continuous casting
- Molten-metal nozzles and handling components
- Plasma-processing insulators
- High-temperature furnace supports and fixtures
- Custom laboratory and research components
Custom Manufacturing Capabilities
- CNC turning and milling
- Precision drilling and boring
- Holes, threads, slots, grooves, and shoulders
- Thin-wall tubes and sleeves
- Stepped, tapered, and flanged structures
- Custom dimensions and tolerances
- Prototype and small-batch production
Frequently Asked Questions
Q1: What are the main advantages of HPBN over alumina or zirconia?
HPBN provides better machinability, thermal-shock resistance, low-friction performance, and high-temperature stability in vacuum or inert atmospheres. It is also non-wetting by many molten materials. However, its mechanical strength, hardness, and wear resistance are lower than those of alumina and zirconia.
Q2: Can HPBN be machined using conventional lathes?
Yes. HPBN can generally be machined using conventional lathes, milling machines, and carbide tools. Achievable tolerances depend on component size, geometry, wall thickness, and material grade. Dust extraction and appropriate personal protection should be used during machining.
Q3: What is the practical operating-temperature limit?
In oxidizing atmospheres, HPBN is generally recommended for use at temperatures up to approximately 850°C. In vacuum or inert atmospheres, selected high-purity grades may operate at temperatures approaching or exceeding 2,000°C. Actual limits depend on the grade, atmosphere, load, and exposure time.
Q4: Are all HPBN grades suitable for vacuum use?
No. Different grades may contain different binders or additives that affect purity, moisture resistance, outgassing, mechanical strength, and maximum service temperature. Material selection should be based on the actual operating environment.
Q5: Can TecCera manufacture parts according to customer drawings?
Yes. Please provide the drawing, required dimensions and tolerances, operating temperature, atmosphere, and application conditions for technical evaluation and quotation.
The properties above are typical reference values and may vary according to grade, orientation, geometry, and test method. Contact TecCera for grade-specific technical confirmation.